CN109974589B - Transmission type photoelectric sensor - Google Patents
Transmission type photoelectric sensor Download PDFInfo
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- CN109974589B CN109974589B CN201811454277.6A CN201811454277A CN109974589B CN 109974589 B CN109974589 B CN 109974589B CN 201811454277 A CN201811454277 A CN 201811454277A CN 109974589 B CN109974589 B CN 109974589B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 17
- 238000009434 installation Methods 0.000 claims abstract description 23
- 238000006073 displacement reaction Methods 0.000 claims abstract description 11
- 238000003708 edge detection Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 21
- QFTYEBTUFIFTHD-UHFFFAOYSA-N 1-[6,7-dimethoxy-1-[1-(6-methoxynaphthalen-2-yl)ethyl]-3,4-dihydro-1H-isoquinolin-2-yl]-2-piperidin-1-ylethanone Chemical compound C1=CC2=CC(OC)=CC=C2C=C1C(C)C(C1=CC(OC)=C(OC)C=C1CC1)N1C(=O)CN1CCCCC1 QFTYEBTUFIFTHD-UHFFFAOYSA-N 0.000 description 12
- 238000005259 measurement Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000004397 blinking Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/08—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
- G01J2001/4446—Type of detector
- G01J2001/4473—Phototransistor
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- Engineering & Computer Science (AREA)
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- Length Measuring Devices By Optical Means (AREA)
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Abstract
Provided is a transmission type photoelectric sensor capable of simplifying the adjustment work of optical axes of a light projector and a light receiver. A transmissive photosensor comprising: a light projector that is fixed to the light projector-side installation surface by a fixing unit and outputs linear light along a one-dimensional direction of the light projector-side installation surface; a light receiver that is fixed to a light receiver-side installation surface extending in the same plane direction as the light projector-side installation surface by a fixing unit, and that receives the offset line light output from the light projector by a light receiving element capable of receiving light in a one-dimensional direction in the same direction as the line light; and a controller that detects a displacement of the object to be inspected between the light projector and the light receiver based on a light reception level of the line light received by the light receiving element, in the transmissive photosensor, the light receiving element has a light receivable area that includes a light projection width of the line light output from the light projector and is wider than the light projection width.
Description
Technical Field
The present invention relates to a transmission type photosensor including, for example, a light projector that outputs laser light and a light receiver that receives light output from the light projector.
Background
The transmission type photoelectric sensor includes a light projector that outputs laser light and a light receiver that receives the laser light as a sensor head. The light projector and the light receiver are disposed to face each other, and the controller detects the light reception level of the laser light at the light receiver, thereby detecting the displacement of the object to be inspected.
A light projector is mounted with a light projecting element for outputting laser light and a lens for converting light emitted from the light projecting element into a linear shape, i.e., a one-dimensional direction, and a case of the light projector is fixed to a mounting surface with screws. A CMOS as a light receiving element is mounted in one dimension on the light receiver, and a case of the light receiver is fixed to an installation surface with screws.
In this case, the light projector and the light receiver are fixed to the installation surface so that the light emitting element and the light receiving element face each other and extend in the same direction.
The laser light output from the light projector is received by the light receiver, and the controller determines the light reception level of the light receiver, thereby detecting the displacement of the inspection object conveyed between the light projector and the light receiver.
As conventional techniques similar to such a transmission type photosensor, patent documents 1 and 2 are known.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2008-275462
Patent document 2: japanese patent laid-open No. 2016 (Japanese patent application laid-open No.)
Disclosure of Invention
Technical problem to be solved by the invention
In the transmissive photosensor as described above, it is necessary to fix the light projector and the light receiver to the installation surface so that the light projection width of the laser light output from the light projector is within the light receiving area of the light receiver, that is, within the installation range of the light receiving unit. When the light receivable area of the light receiver deviates from the light projection width, the displacement of the object cannot be detected normally.
When the light projector and the light receiver are fixed to the installation surface, the light projector and the light receiver are fixed to the installation surface with screws in a state where the optical axis is adjusted so that the light projection width of the light projector is located within the light receiving area of the light receiver.
However, since the optical axes of the light projector and the light receiver may be deviated in one-dimensional direction when they are fixed by screws, and in this case, it is necessary to perform the optical axis adjustment again, the optical axis adjustment work is complicated.
The present invention has been made in view of such circumstances, and an object thereof is to provide a transmission type photosensor capable of simplifying the adjustment work of the optical axes of a light projector and a light receiver.
Means for solving the problems
A transmission type photoelectric sensor for solving the above problems includes: a light projector fixed to a light projector-side installation surface by a fixing unit, the light projector outputting line light along a one-dimensional direction of the light projector-side installation surface; a light receiver fixed to a light receiver-side installation surface extending in the same plane direction as the light projector-side installation surface by a fixing unit, the light receiver including a light receiving element having a plurality of light receiving units capable of receiving the linear light output from the light projector in a one-dimensional direction in the same direction as the linear light, the light receiving element receiving the linear light; and a controller that detects a displacement of an object to be inspected positioned between the light projector and the light receiver based on a light reception level of the linear light received by the light receiving element, wherein the light receiving element includes a light receivable area that includes a light projection width of the linear light output from the light projector and is wider than the light projection width.
With this structure, the tolerance for deviation of the optical axes of the light projector and the light receiver is improved.
In the transmissive photosensor, the controller preferably includes a first setting unit that detects a light receiving region that receives the linear light at a light receiving level equal to or higher than a reference level from among the light receiving areas of the light receiving elements, and sets an effective region based on a range of the light receiving region and a range set in advance.
With this configuration, the influence of disturbance light incident on the light-receivable area other than the effective area can be suppressed in the execution mode.
In the transmissive photosensor, the controller preferably includes a second setting unit that adjusts a range of the effective region.
With this configuration, by setting the effective area AR2 to be narrow as necessary, it is possible to increase the tolerance for misalignment between the optical axes of the light projector 1 and the light receiver 2.
In the transmissive photosensor, the controller preferably includes: an edge detection unit that detects an edge of the light receiving area; and a third setting unit configured to remove the detected edge from the effective area.
With this configuration, the edge of the light receiving region can be removed from the effective region.
Further, it is preferable that in the transmissive photosensor described above, the controller includes an error display unit that displays an error when the effective area does not fall within the range of the light receiving area.
According to this configuration, in the case where the effective area is deviated from the light receivable area, since an error is displayed on the display screen, erroneous setting of the effective area is suppressed.
In the transmissive photosensor, it is preferable that the light receiver includes a light receiving window that receives and supplies the line light to the light receiving element, a center of the light receiving element in the one-dimensional direction is shifted from a center of the light receiving window in the one-dimensional direction, and the controller reads out a light reception signal sequentially from the light receiving unit located at one end of the light receiving element at a short distance from an end of the light receiving window.
According to this configuration, in the execution mode, when reading out the light reception levels from the respective cells of the light receiving element, since the light reception levels are read out sequentially from the light receiving cell located at the end portion on the side closer to the center of the light receiving window, the time required for reading out the light reception levels of the effective region is shortened. In addition, since the process of reading the light reception level from each cell after reading the signal reception level of the effective region can be omitted, the reading time at the time of the repeated reading can also be shortened.
Effects of the invention
According to the transmissive photosensor of the present invention, the adjustment work of the optical axes of the light projector and the light receiver can be simplified.
Drawings
Fig. 1 is a perspective view showing a transmissive photosensor.
Fig. 2 is a perspective view showing the optical receiver.
Fig. 3 is a perspective view showing a light receiving element in the light receiver.
Fig. 4 is a front view showing the controller.
Fig. 5 is a block diagram showing an electrical structure of the transmissive photosensor.
Fig. 6 is a flowchart showing the operation of the transmission type photosensor.
Fig. 7 is an explanatory diagram showing the light reception level detected with the light receiving element.
Fig. 8 is an explanatory diagram illustrating an operation of setting the effective region.
Fig. 9 is an explanatory diagram illustrating an operation of setting the effective region.
Description of the symbols
1 light projector, 2 light receiver, 3 controller (first setting unit, second setting unit, third setting unit, edge detection unit, error display unit), 8 light receiving window, 9 light receiving element, 11 error display unit (display screen), L-line light (laser), ARp receivable light area, AR1 light receiving area, AR2 effective area, a light projection width, RL light receiving level, S reference level, EG edge.
Detailed Description
Hereinafter, an embodiment of a transmission type photosensor will be described with reference to the drawings.
The transmission type photoelectric sensor shown in fig. 1 includes a light projector 1, a light receiver 2, and a controller 3. The light projector 1 and the light receiver 2 are provided with cases 4 and 5 having the same outer dimensions, respectively. The cases 4 and 5 are formed of, for example, rectangular parallelepiped with a thickness of 10mm, and mounting holes 6 penetrating the cases 4 and 5 in the thickness direction are provided at the corners of the diagonal positions of the main surface of the rectangular parallelepiped. One side surfaces (one of the main surfaces) 4a and 5a of the cases 4 and 5 in the thickness direction are fixed to the mounting surface by screws inserted through the mounting holes 6. The light projector side installation surface and the light receiver side installation surface that fix the cases 4 and 5 are flat surfaces that form a part of the same surface.
In the case 4 of the light projector 1, a light projection window 7 is formed on one of side surfaces orthogonal to the side surface 4a in the longitudinal direction. The light projection window 7 is opened in a rectangular shape along the longitudinal direction of the case 4. Further, a cable 4b extends from one of the side surfaces orthogonal to the side surface 4a in the short direction, and is connected to the controller 3.
In the case 4 of the light projector 1, light projection elements for outputting laser light are mounted side by side in a one-dimensional direction along the longitudinal direction of the light projection window 7. Then, the laser light (linear light) L in the one-dimensional direction output from the light projection element is emitted from the light projection window 7.
As shown in fig. 2, in the case 5 of the light receiver 2, a light receiving window 8 is formed on one of side surfaces orthogonal to the side surface 5a in the longitudinal direction. The light receiving window 8 is rectangular in size and shape as the light projection window 7, and is opened in the longitudinal direction of the case 5. Further, a cable 5b extends from one of the side surfaces orthogonal to the side surface 5a in the short side direction, and is connected to the controller 3.
The light projector 1 and the light receiver 2 are fixed to the installation surface by screws or other fixing means so that the light projection window 7 and the light projection window 8 face each other.
As shown in fig. 3, in the case 5 of the light receiver 2, a light receiving element 9 that receives laser light is mounted along the light receiving window 8. The light receiving element 9 is made of, for example, a Complementary Metal Oxide Semiconductor (CMOS). The light-receivable area ARp of the light-receiving element 9 capable of receiving laser light is formed to be wider than the width in the longitudinal direction of the light-receiving window 8, and the center position X in the longitudinal direction of the light-receivable area ARp does not coincide with the center Y in the longitudinal direction of the light-receiving window 8. In fig. 3, the center position X in the longitudinal direction of the light receivable area ARp is shifted downward from the center Y in the longitudinal direction of the light receiving window 8, and the distance D1 between one end 9a (upper end in fig. 3) of the light receiving element 9 and the upper end of the light receiving window 8 is shorter than the distance D2 between the other end 9b (lower end in fig. 3) of the light receiving element 9 and the lower end of the light receiving window 8.
The light receiving element 9 is connected to a light receiving circuit, not shown, which is connected to the cable 5b via a flexible cable 26 and a connector 27. The light reception signal of the light receiving element 9 is output to the controller 3 through the cable 5 b.
As shown in fig. 4, the front surface of the rectangular parallelepiped case 10 of the controller 3 is provided with: a display screen 11, a left key 12, a right key 13, an up key 14, a down key 15, an enter key 16, a back key 17, preset keys 18, output display lamps 19a to 19c and an input display lamp 20a, and a preset display lamp 20 b.
The left key 12, right key 13, up key 14, down key 15, enter key 16, escape key 17, and preset key 18 are used for various settings. The output display lamps 19a to 19c, the input display lamp 20a, and the preset display lamp 20b display the input/output state of the controller 3, and the display screen 11 displays the setting contents in the setting mode, the measurement state in the execution mode for detecting the displacement of the object to be inspected, the error display, and the like.
A cable 28 is connected to one side surface of the case 10 of the controller 3 in the longitudinal direction. The cables 28 collectively connect the cables 4b and 5b extending from the light projector 1 and the light receiver 2 to the controller 3, and the light projector 1 and the light receiver 2 are electrically connected to the controller 3.
Fig. 5 shows the electrical structure of the light projector 1, the light receiver 2, and the controller 3. The light projection unit 21 of the light projector 1 includes a laser diode and a driving unit for the laser diode, and the light reception unit 22 of the light receiver 2 includes a CMOS serving as the light reception element 9 and an output unit for outputting a reception signal of the light reception element 9 to the CPU 23.
The controller 3 incorporates a CPU23 and is provided with a display unit 24 and an operation unit 25. The display unit 24 includes the display screen 11, the display lamps 19a to 19c, and 20, and driving units for these components, and the operation unit 25 includes the keys 12 to 18.
The CPU23 operates based on a preset program, displays the setting contents set by the operation unit 25 in the setting mode on the display unit 24, and drives the light projection unit 21 to output the laser light L. Then, the setting operation is performed based on the light reception signal of the light reception unit 22.
In the execution mode, the light projection unit 21 is driven to output the laser light L, and the measurement result of the object to be inspected is determined based on the light reception signal of the light reception unit 22, and the determination result is displayed on the display unit 24.
Next, the operation of the transmission type photoelectric sensor configured as described above will be described.
Fig. 6 shows a flow of setting the transmission type photosensor at the set position until the measurement action is started.
After the light projector 1 and the light receiver 2 are fixed at the installation positions by screws and connected to the controller 3, when the transmission type photoelectric sensor is powered on, first, the optical axis adjustment process is performed (step 1). The optical axis adjustment process determines whether or not the optical axes of the light projector 1 and the light receiver 2 are appropriate, and if not appropriate, performs an adjustment operation so that the positions of the optical axes become appropriate.
Next, a reference waveform registration process is performed (step 2). The reference waveform registration processing sets a threshold value of a light reception level, a filter value, and the like at the time of setting or resetting the light projector 1 and the light receiver 2.
Next, after the execution mode (measurement mode) is selected (step 3) and the measurement direction is selected (step 4), the measurement operation for detecting the displacement of the test object is started.
Next, the optical axis adjustment processing in step 1 will be described.
In fig. 7, the laser light L emitted from the light projector 1 passes through the light projection window 7 and the light receiving window 8 and is received by the light receiving element 9. The laser light L is received by the light receiving element 9 as laser light in the one-dimensional direction of the light projection width a.
The light receiving element 9 includes a CMOS (a plurality of cells are arranged in a row) so as to be able to receive the laser light L in one dimension in the receivable light area Arp wider than the width in the longitudinal direction of the light receiving window 8 as described above.
The light reception level RL of the laser light L formed by the light receiving element 9 generates noise NPL due to fresnel analysis at the edge EG which is both ends of the light projection width a. If the light reception level RL includes the noise NRL, there is a possibility that the detection cannot be performed normally when the displacement of the object is detected.
Therefore, it is necessary to set an area where no noise NRL is generated in the light receiving area AR1 of the light receiving element 9 as the effective area AR2 and detect the displacement of the object based on the light reception level RL of the effective area AR 2.
When the optical axis adjustment process is started, the CPU23 outputs laser light L from the light projector 1, and determines the light reception level RL of the reception signal output from the light receiving element 9 of the light receiver 2. At this time, the light reception level RL is sequentially read out from a cell on one end side of the light receiving element 9, that is, on the upper end side in fig. 3.
As shown in fig. 8, the CPU23 then compares the light reception level RL of the reception signals sequentially read from the plurality of cells of the light receiving element 9 with a preset reference level S to obtain a comparison result signal CR that is set to the H level when the light reception level RL is higher than the reference level S. The comparison result signal CR shows a unit located at an area where the laser light L from the light projector 1 is received, among the units of the light-receiving element 9 capable of receiving the light area ARp, which the CPU23 recognizes as the light-receiving area AR 1.
The light reception level RL shown in fig. 8 indicates the light reception level of the reception signal sequentially read out from the light receiving element 9 from left to right.
Next, the CPU23 determines a cell position P1 at which the light reception level RL exceeds the reference level S, and determines a cell position P2 spaced apart from the cell position P1 by a predetermined number X1 of cells set in advance.
Also, the cell position P3 further spaced by a predetermined number X2 cells from the cell position P2 is determined, and the region between the cell position P2 and the cell position P3 is set as the effective region AR 2. Also, if the comparison result signal CR of the cell position P3 is H level, the CPU23 recognizes that the setting of the effective area AR2 is normal, and displays "OK" on the display screen 11.
On the contrary, as shown in fig. 9, in the case where the unit position P3 is deviated from the light receivable area ARp, it is recognized that the setting of the effective area AR2 is abnormal, and "ERR" is displayed on the display screen 11.
The CPU23 has a function of arbitrarily setting the range of the effective area AR2, that is, the number of cells, prior to the optical axis adjustment processing.
When the exit key 17 of the controller 3 is pressed, the CPU23 goes to the SET mode and displays "SET" on the display screen 11.
Next, the CPU23 displays the number of cells of the effective area AR2 being set at present, that is, the above-mentioned predetermined number X2. When the up key 14 or the down key 15 is operated from this state, the predetermined number X2 is increased or decreased.
Also, after setting the predetermined number X2 to a desired number, when the enter key 16 is pressed, the CPU23 takes the newly set predetermined number X2 as the effective area AR2, and blinks the predetermined number X2 for several seconds and displays the predetermined number X2 that has been determined on the display screen 11.
Next, the CPU23 displays "SET" on the display screen 11 again, and returns to the execution mode when the exit key 17 is pressed in this state. When the enter key 16 is pressed, the setting mode is entered again.
In the transmissive photosensor described above, the following effects can be obtained.
(1) Since the light receivable area ARp of the light receiving element 9 is wider than the light projection width a of the light projector 1, when the light projector 1 and the light receiver 2 are fixed to the mounting surface with screws, even if the optical axes of the light projecting element and the light receiving element 9 are deviated in the one-dimensional direction of the extension of the light projecting element and the light receiving element 9 due to the deviation of the fixing positions thereof, the light projection width a easily falls within the range of the light receiving element 9 capable of receiving the light receivable area ARp. Therefore, the possibility that the fixed positions of the light projector 1 and the light receiver 2, that is, the optical axis, need to be readjusted can be reduced.
(2) In the setting mode, the light receiving element 9 of the light receiver 2 can set a predetermined range as the effective area AR2 within the range of the light receiving area AR1 in which the light receiving level RL of the laser light L output from the light projector 1 is greater than the reference level S. In addition, since the displacement of the object is detected based on the light reception level RL of the effective area AR2 in the execution mode, it is possible to prevent erroneous detection of the object due to the influence of disturbance light incident in the receivable light area Arp other than the effective area AR 2.
(3) The width of the effective area AR2 can be set arbitrarily. By setting the effective area AR2 to be narrow as necessary, the tolerance for deviation of the fixed positions of the light projector 1 and the light receiver 2 is improved. Therefore, the possibility that the fixing positions of the light projector 1 and the light receiver 2 must be readjusted can be further reduced.
(4) At the setting of the effective area AR2, a cell position P1 from when the light reception level RL is less than the reference level S to when it reaches the reference level S is determined, and a cell position P3 further apart by a predetermined number X2 from the cell position P2 is determined, the cell position P2 being apart by a predetermined number X1 set in advance from the cell position P1. Further, since the region between the cell position P2 and the cell position P3 is set as the effective region AR2, the edge EG of the light-receiving region AR1 can be removed from the effective region AR 2. Therefore, in the execution mode, the influence of the noise NRL generated at the edge EG can be removed, and the inspection accuracy of the object to be inspected can be improved.
(5) At the time of setting of the effective area AR2, in the case where there is a cell position where the light reception level RL does not reach the reference level S at the effective area AR2 to be set, or in the case where the effective area AR2 is out of the light-receivable area ARp, an error can be displayed on the display screen 11. Therefore, erroneous setting of effective area AR2 can be suppressed.
(6) The center position X in the longitudinal direction of the light receivable area ARp of the light receiving element 9 is shifted to a position not coinciding with the center Y in the longitudinal direction of the light receiving window 8, and the distance D1 between the one end 9a of the light receivable area ARp of the light receiving element 9 and the end on the end 9a side of the light receiving window 8 is shorter than the distance D2 between the other end 9b of the light receiving element 9 and the end on the end 9b side of the light receiving window 8. Therefore, in the execution mode, when reading out the light reception level RL from each cell of the light reception element 9, the light reception level RL is read out sequentially from the end portion 9a on the side closer to the center Y of the light reception window 8, so the time required until reading out the light reception level RL of the effective area AR2 can be shortened.
The above embodiment may be modified as follows.
The light projector 1 and the light receiver 2 may be fixed to the installation surface by fixing means other than screws.
The light output from the light projector 1 may be light other than laser light.
As the light receiving element 9, a two-dimensional CMOS may be used. In this case, only a linear one-dimensional region may be used.
The linear light output from the light projection element includes not only one-dimensional light but also light in a band shape with a minute width.
The display of "OK" and "ERR" may be displayed by other characters, symbols, marks, or the like, or may be displayed by turning on or off an indicator light, blinking, changing a display color, or the like.
The dimensions of the light projector 1 and the light receiver 2 may be different.
Claims (6)
1. A transmission type photoelectric sensor includes:
a light projector fixed to a light projector-side installation surface by a fixing unit, the light projector outputting line light along a one-dimensional direction of the light projector-side installation surface;
a light receiver fixed to a light receiver-side installation surface extending in the same plane direction as the light projector-side installation surface by a fixing unit, the light receiver including a light receiving element having a plurality of light receiving units capable of receiving the linear light output from the light projector in a one-dimensional direction in the same direction as the linear light, the light receiving element receiving the linear light; and
a controller that detects a displacement of an object to be inspected between the light projector and the light receiver based on a light reception level of the linear light received with the light receiving element, the transmission type photosensor characterized in that,
the light receiving element includes a light receivable area including a light projection width of the line light output from the light projector and wider than the light projection width,
the light receiver is provided with a light receiving window that takes in and supplies the line light to the light receiving element,
the center position in the longitudinal direction of the light-receivable area does not coincide with the center in the longitudinal direction of the light-receiving window.
2. The transmissive photosensor according to claim 1,
the controller includes a first setting unit that detects a light receiving region in which the linear light is received at a light receiving level equal to or higher than a reference level from among the light-receivable regions of the light receiving element, and sets an effective region based on a range of the light receiving region and a range set in advance.
3. The transmissive photosensor according to claim 2,
the controller includes a second setting unit that adjusts a range of the effective region.
4. A transmissive photosensor according to claim 2 or 3,
the controller is provided with:
an edge detection unit that detects an edge of the light receiving area; and
a third setting unit configured to remove the detected edge from the effective area.
5. A transmissive photosensor according to claim 2 or 3,
the controller is provided with an error display unit that displays an error when the effective area does not fall within the range of the light receiving area.
6. A transmissive photosensor according to any one of claims 1 to 3,
a center of the one-dimensional direction of the light receiving element is offset with respect to a center of the one-dimensional direction of the light receiving window,
the controller reads out light reception signals sequentially from the light receiving unit located at one end of the light receiving element at a closer distance from an end of the light receiving window.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017251636A JP2019117130A (en) | 2017-12-27 | 2017-12-27 | Translucent photoelectric sensor |
| JP2017-251636 | 2017-12-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109974589A CN109974589A (en) | 2019-07-05 |
| CN109974589B true CN109974589B (en) | 2021-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811454277.6A Active CN109974589B (en) | 2017-12-27 | 2018-11-30 | Transmission type photoelectric sensor |
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| Country | Link |
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| JP (1) | JP2019117130A (en) |
| KR (1) | KR102045688B1 (en) |
| CN (1) | CN109974589B (en) |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6461603A (en) * | 1987-09-02 | 1989-03-08 | Mitsubishi Heavy Ind Ltd | Method and device for detecting camber of beltlike body |
| JPH0583981U (en) * | 1992-04-20 | 1993-11-12 | 竹中エンジニアリング株式会社 | Reflective photoelectric switch |
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| JP2009002701A (en) * | 2007-06-19 | 2009-01-08 | Yamatake Corp | Edge detector and line sensor for edge detector |
| JP5410137B2 (en) * | 2009-03-31 | 2014-02-05 | パナソニック デバイスＳｕｎｘ株式会社 | Photoelectric sensor |
| JP5507879B2 (en) * | 2009-04-24 | 2014-05-28 | 株式会社キーエンス | Transmission type measuring device |
| JP5507895B2 (en) * | 2009-06-09 | 2014-05-28 | 株式会社キーエンス | Transmission type measuring device |
| CZ2010423A3 (en) * | 2010-05-28 | 2010-08-18 | Perner@Petr | Method and apparatus for continuous detection of thickness and/or homogeneity of a linear configuration, especially textile fiber |
| JP6285376B2 (en) | 2015-02-19 | 2018-02-28 | アズビル株式会社 | Edge detection device |
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2017
- 2017-12-27 JP JP2017251636A patent/JP2019117130A/en active Pending
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2018
- 2018-11-28 KR KR1020180149750A patent/KR102045688B1/en active IP Right Grant
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| CN109974589A (en) | 2019-07-05 |
| JP2019117130A (en) | 2019-07-18 |
| KR102045688B1 (en) | 2019-11-15 |
| KR20190079505A (en) | 2019-07-05 |
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